Journal ArticleDOI
Soft FerritesߞProperties and Applications
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In this paper, the authors discuss the properties and applications of soft and hard ferrites and their applications in search-works, including the application of soft ferrite material from emc to rfid.Abstract:
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Citations
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Journal ArticleDOI
Computationally efficient winding loss calculation with multiple windings, arbitrary waveforms, and two-dimensional or three-dimensional field geometry
TL;DR: The squared-field-derivative method for calculating eddy-current (proximity effect) losses in round-wire or litz-wire transformer and inductor windings is derived in this paper.
Journal ArticleDOI
Cost-constrained selection of strand diameter and number in a litz-wire transformer winding
TL;DR: In this article, the relationship between wire size, normalized cost, and normalized loss is shown to have a general form that applies to a wide range of designs, and a practical design procedure is provided, applied to an example design, it leads to less than half the original loss at lower than the original cost, or, alternatively, under one fifth the original costs with the same loss as the original design.
Journal ArticleDOI
Experimental determination of stray capacitances in high frequency transformers
TL;DR: In this paper, the two-port network approach and the step-response approach are used for determining stray capacitances in a two-winding high frequency transformer for circuit simulation and computeraided design purposes.
Journal ArticleDOI
Measurements and performance factor comparisons of magnetic materials at high frequency
TL;DR: In this paper, the design of power magnetic components for operation at high frequency (HF, 3-30 MHz) has been hindered by a lack of magnetic material performance data and by the limited design theory in that frequency range.
Proceedings ArticleDOI
Core losses under DC bias condition based on Steinmetz parameters
TL;DR: In this paper, the Steinmetz premagnetization graph (SPG) is introduced to calculate core losses under DC bias conditions, and a detailed description of the test system is given, as high accuracy is crucial.
References
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Proceedings ArticleDOI
Analytical model for effects of twisting on litz-wire losses
TL;DR: In this article, a complete model that explicitly models the effect of twisting on loss is introduced, where skin effect and proximity effect are each modeled at the level of individual strands and at each level of the twisting construction.
Proceedings ArticleDOI
Integrating magnetics for on-chip power: Challenges and opportunities
TL;DR: General design possibilities are outlined and different approaches are compared for both air-core and magnetic-core inductors, and nano-granular composite materials are highlighted as an attractive option.
Journal ArticleDOI
Analysis Model for Magnetic Energy Harvesters
Jinyeong Moon,Steven B. Leeb +1 more
TL;DR: In this article, the authors provide a technique for design optimization for maximizing power harvest, revealing a critical result: for any given core in any particular application, power harvest is maximized when the core is permitted to saturate at an opportune time in the line cycle.
Dissertation
Actuation of shape memory polymer using magnetic fields for applications in medical devices
Abstract: A novel approach to the heating and actuation of shape memory polymer using dispersed Curie temperature thermo-regulated particles is proposed. Such a material has potential applications in medical devices which are delivered via catheters. A variety of tests were performed to determine the feasibility of this new approach to shape memory polymer actuation. Calorimetry tests were performed to quantify heat generation of various Nickel Zinc Ferrite particles. Dynamic Mechanical Thermal Analysis (DMTA), tensile strain recovery tests, and Differential Scanning Calorimetry (DSC) were used to measure the mechanical effects of various particle volume contents and sizes on shape memory polymer. These tests suggest that the proposed method of actuation is very feasible, rapid heating can be achieved and the addition of particles up to 10% volume content has a minimal effect on the mechanical properties of the shape memory polymer. Thesis Supervisor: Gareth Mckinley Title: Professor of Mechanical Engineering
Proceedings ArticleDOI
Optimization of stranded-wire windings and comparison with litz wire on the basis of cost and loss
Xu Tang,Charles R. Sullivan +1 more
TL;DR: In this article, the authors developed a method to optimize strand-wire designs on the basis of cost and loss, and compared the results to optimized litz-wire design, using a simply calculated parameter to predict when each type of wire is preferred.